Drupal Core Adds Experimental “Admin” Theme After Gin–Claro Merge

Drupal core introduces an experimental theme named admin, merging the contributed Gin interface with the foundations of the Claro theme in a move to consolidate development of Drupal’s administrative experience.

The change was committed through Drupal core issue #3556948, which tracks the work to merge the contributed Gin administrative theme into core under the name Admin. The issue was closed after the merge request introducing the new theme landed in Drupal’s main development branch.

The work follows years of parallel development between Drupal’s two primary administrative themes. Gin historically extended the Claro theme, creating overlap across templates, CSS, JavaScript, and PHP code. Contributors involved in the merge say bringing the projects together in core should simplify maintenance and accelerate improvements to Drupal’s editorial interface.

The merged work introduces several configuration flags that control parts of the new administrative experience. Two settings referenced in the core issue are $settings['core_admin_theme_use_sticky_action_buttons'] and $settings['user_login_admin_theme']. The sticky action button setting defaults to never, with additional values of content_forms and always. The login theme setting defaults to TRUE.

Testing instructions published in the issue show how developers can evaluate the theme on development builds. Contributors can apply the merge request patch to Drupal 11.x, enable the admin theme, set it as the administrative theme using configuration commands, and rebuild caches to activate the interface.

The feature was committed as an experimental component, meaning it does not yet need to meet all Drupal core stability or accessibility gates. According to core maintainer commentary in the issue discussion, the experimental stage allows contributors to continue reviewing the implementation and plan follow-up work before the theme becomes stable.

Drupal contributors say the long-term objective is for the Admin theme to replace Claro as Drupal’s default administrative interface once development and testing mature. Until then, Claro will remain the default admin theme for Drupal installations while the new theme evolves in core.